Polymers of galactouronic acid are hydrolysed by .

Options

A. Proteases
B. Pectinase
C. Invertases
D. Lipases

Answer

### Step-by-Step Solution:

1. **Understanding the Question**: The question asks about the hydrolysis of polymers of galacturonic acid. Galacturonic acid is a component of pectin, which is found in the cell walls of plants.

2. **Identifying the Hydrolysis Process**: Hydrolysis is a chemical process that involves the breakdown of a compound due to reaction with water. In this case, we are looking for the specific enzyme that catalyzes the hydrolysis of pectin, which is a polymer of galacturonic acid.

3. **Identifying the Correct Enzyme**: The enzyme responsible for hydrolyzing pectin is called pectinase. This enzyme breaks down pectin into its monomeric units, including galacturonic acid.

4. **Evaluating Other Options**:
- **Protease**: This enzyme hydrolyzes proteins, not pectin.
- **Invertase**: This enzyme hydrolyzes sucrose into glucose and fructose, not pectin.
- **Lipase**: This enzyme hydrolyzes fats, not pectin.

5. **Conclusion**: Based on the analysis, the correct answer to the question is that polymers of galacturonic acid are hydrolyzed by pectinase.

### Final Answer:
Polymers of galacturonic acid are hydrolyzed by **pectinase**.

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